I've gotten to the point that my memory really stinks. I use Notetab Standard for my text files and it has a thing called an .otl file, where you can have a bunch of different headings listed over to the left and you can click on a heading and whatever is there opens up. I use an .otl file and put a heading for each thing I want to remember.
If it's something that I want to remember to do, I email myself with the day and a few words about what I have to do in the subject line, and if I have to go into detail, I just put that in the body of the email. I make it a point to keep that email as unread til I get it done so it'll be in bold type.